For many people customizing the look of your profile is key. Thats why we launched the profile editor, that's why we added link color customization ( edit style page), and that's why today we have added a tool for uploading any image and a set of stock images to use for the color or background image of your headers.
This new tool opens an enormous can of worms with which we can give users a way to upload any kind of image for use as a background on their page, on the frames, on the headers, on anything really.
To start using your own custom backgrounds, go to the edit style page, in the top left above the color code column is a form for uploading images, select an image to upload, give the image a name, upload it, then in the right hand column you'll see a list of images, there is list of the images you've uploaded and a list of the images we've uploaded for anyone to use. Select the image you want to use as your header background, click save and WHOLLA!